Commit d3f77058 authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Jonathan Cameron

iio: imu: st_lsm6dsx: add system power management support

Add system sleep power management support to st_lsm6dsx driver.
In particular during suspend phase each sensor is disabled and
hw fifo is configured in bypass in order to avoid subsequent
I/O operations. The patch has been tested on HiKey board device
Signed-off-by: default avatarLorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 535de397
...@@ -135,6 +135,8 @@ struct st_lsm6dsx_hw { ...@@ -135,6 +135,8 @@ struct st_lsm6dsx_hw {
#endif /* CONFIG_SPI_MASTER */ #endif /* CONFIG_SPI_MASTER */
}; };
extern const struct dev_pm_ops st_lsm6dsx_pm_ops;
int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name, int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name,
const struct st_lsm6dsx_transfer_function *tf_ops); const struct st_lsm6dsx_transfer_function *tf_ops);
int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor); int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor);
......
...@@ -36,6 +36,7 @@ ...@@ -36,6 +36,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/iio/iio.h> #include <linux/iio/iio.h>
#include <linux/iio/sysfs.h> #include <linux/iio/sysfs.h>
#include <linux/pm.h>
#include <linux/platform_data/st_sensors_pdata.h> #include <linux/platform_data/st_sensors_pdata.h>
...@@ -731,6 +732,59 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name, ...@@ -731,6 +732,59 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name,
} }
EXPORT_SYMBOL(st_lsm6dsx_probe); EXPORT_SYMBOL(st_lsm6dsx_probe);
#ifdef CONFIG_PM
static int st_lsm6dsx_suspend(struct device *dev)
{
struct st_lsm6dsx_hw *hw = dev_get_drvdata(dev);
struct st_lsm6dsx_sensor *sensor;
int i, err = 0;
for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
sensor = iio_priv(hw->iio_devs[i]);
if (!(hw->enable_mask & BIT(sensor->id)))
continue;
err = st_lsm6dsx_write_with_mask(hw,
st_lsm6dsx_odr_table[sensor->id].reg.addr,
st_lsm6dsx_odr_table[sensor->id].reg.mask, 0);
if (err < 0)
return err;
}
if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS)
err = st_lsm6dsx_flush_fifo(hw);
return err;
}
static int st_lsm6dsx_resume(struct device *dev)
{
struct st_lsm6dsx_hw *hw = dev_get_drvdata(dev);
struct st_lsm6dsx_sensor *sensor;
int i, err = 0;
for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
sensor = iio_priv(hw->iio_devs[i]);
if (!(hw->enable_mask & BIT(sensor->id)))
continue;
err = st_lsm6dsx_set_odr(sensor, sensor->odr);
if (err < 0)
return err;
}
if (hw->enable_mask)
err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT);
return err;
}
#endif /* CONFIG_PM */
const struct dev_pm_ops st_lsm6dsx_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(st_lsm6dsx_suspend, st_lsm6dsx_resume)
};
EXPORT_SYMBOL(st_lsm6dsx_pm_ops);
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>"); MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsx driver"); MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsx driver");
......
...@@ -98,6 +98,7 @@ MODULE_DEVICE_TABLE(i2c, st_lsm6dsx_i2c_id_table); ...@@ -98,6 +98,7 @@ MODULE_DEVICE_TABLE(i2c, st_lsm6dsx_i2c_id_table);
static struct i2c_driver st_lsm6dsx_driver = { static struct i2c_driver st_lsm6dsx_driver = {
.driver = { .driver = {
.name = "st_lsm6dsx_i2c", .name = "st_lsm6dsx_i2c",
.pm = &st_lsm6dsx_pm_ops,
.of_match_table = of_match_ptr(st_lsm6dsx_i2c_of_match), .of_match_table = of_match_ptr(st_lsm6dsx_i2c_of_match),
}, },
.probe = st_lsm6dsx_i2c_probe, .probe = st_lsm6dsx_i2c_probe,
......
...@@ -115,6 +115,7 @@ MODULE_DEVICE_TABLE(spi, st_lsm6dsx_spi_id_table); ...@@ -115,6 +115,7 @@ MODULE_DEVICE_TABLE(spi, st_lsm6dsx_spi_id_table);
static struct spi_driver st_lsm6dsx_driver = { static struct spi_driver st_lsm6dsx_driver = {
.driver = { .driver = {
.name = "st_lsm6dsx_spi", .name = "st_lsm6dsx_spi",
.pm = &st_lsm6dsx_pm_ops,
.of_match_table = of_match_ptr(st_lsm6dsx_spi_of_match), .of_match_table = of_match_ptr(st_lsm6dsx_spi_of_match),
}, },
.probe = st_lsm6dsx_spi_probe, .probe = st_lsm6dsx_spi_probe,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment